EA170-34100 Danaher
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The Danaher EA170-34100 is part of the Snaplock Limit Switches series and features a contact arrangement of 2 normally open and 2 normally closed, with Form Z silver alloy contacts. This switch supports a long mounting style and has a lever adjustment range of 167 degrees, with individual steps of 7 degrees 30 minutes. It is housed in a NEMA 1, 4, 13 enclosure and requires 32 inch-pounds of torque to trip.
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Product Description:
The EA170-34100 is a rotary limit switch produced by Danaher for the Snaplock Limit Switches series. It mounts to a driven shaft and translates angular motion into electrical signals so that programmable controllers or relay panels can start, stop, or sequence equipment at precise positions. By combining mechanical snap action with sealed contacts, the device supports industrial automation applications that require repeatable cam-based indexing under moderate exposure to dust, water, or oil. Its shaft-driven design allows machine motion to actuate electrical circuits at selected angular positions without relying on separate electronic position sensors.
Electrically, the switch carries two normally open and two normally closed contacts arranged in Form Z, so opposing poles change state simultaneously. These elements are fabricated from silver alloy, a material chosen for low contact resistance and high current endurance. Each pair uses a butt-contact arrangement to provide reliable switching when the internal cam mechanism reaches its actuation point. The internal mechanism has a double-pole, double-throw configuration that allows independent safety and control circuits to be wired through the same device. With this layout, the unit can interrupt power to a motor while sending a confirmation signal to a programmable logic controller during a single shaft revolution.
The lever can be adjusted through a maximum range of 167°, and indexing is performed in discrete steps of 7°30′ using the integral detent to match the machine pitch. A trip torque of 32 in-lb overcomes the spring and cam resistance, supporting consistent switch action in installations that require positive clockwise rotation. The total available travel is 36°, with an operating window that begins at a trip point of 6°30′, continues for a recommended span of 7°, and resets after 4° of reverse motion. This adjustment range permits the switching point and reset behavior to be aligned with the movement of connected cams, gear reducers, or indexed machine shafts. The housing meets NEMA 1, 4, and 13 ratings, allowing installation in general-purpose, watertight, and oil-tight enclosures. Its long mounting style simplifies alignment on gear reducers or cam stacks where additional spacing is needed between the switch body and the driven mechanism.
